EP 1825464 B1 20090311 - DEVICE AND METHOD FOR USE IN OPTICAL RECORD CARRIER SYSTEMS
Title (en)
DEVICE AND METHOD FOR USE IN OPTICAL RECORD CARRIER SYSTEMS
Title (de)
VORRICHTUNG UND VERFAHREN ZUR VERWENDUNG IN OPTISCHEN AUFZEICHNUNGSTRÄGERSYSTEMEN
Title (fr)
DISPOSITIF ET PROCEDE UTILISES DANS DES SYSTEMES DE SUPPORTS D'ENREGISTREMENTS OPTIQUES
Publication
Application
Priority
- IB 2005054005 W 20051201
- EP 04106317 A 20041206
- EP 05826711 A 20051201
Abstract (en)
[origin: WO2006061748A1] A signal-processing device (301) for controlling a focus actuator (309) in an optical disc system (30), wherein the signal processing device (309) generates a focus actuator control signal (CS) to be supplied to the focus actuator (309). The focus actuator control signal (CS) is based on a focus error signal (FE) and a central aperture signal (CA). If the central aperture signal (CA) is equal to or above a certain threshold value the focus actuator control signal will correspond to the focus error signal (FE). However, when the central aperture signal is below the threshold value the focus actuator control signal will have a predefined level. By providing a focus actuator control signal (CS) in accordance herewith it is possible to extend the regions of the focus error signal (FE) in which the relative distance between the focus point and the data layer of the record medium (304) is not correctly represented. The provision of the control signal (CS) enables improvements of the start-up and recovery performance of optical disc systems, especially under vibrating conditions.
IPC 8 full level
G11B 7/09 (2006.01)
CPC (source: EP KR US)
G11B 7/09 (2013.01 - KR); G11B 7/0945 (2013.01 - EP US); G11B 7/0946 (2013.01 - EP US); G11B 20/10 (2013.01 - KR)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006061748 A1 20060615; AT E425534 T1 20090315; CN 101073112 A 20071114; CN 101073112 B 20110209; DE 602005013280 D1 20090423; EP 1825464 A1 20070829; EP 1825464 B1 20090311; JP 2008523535 A 20080703; KR 20070095315 A 20070928; TW 200634784 A 20061001; US 2009129216 A1 20090521; US 7848188 B2 20101207
DOCDB simple family (application)
IB 2005054005 W 20051201; AT 05826711 T 20051201; CN 200580041862 A 20051201; DE 602005013280 T 20051201; EP 05826711 A 20051201; JP 2007545029 A 20051201; KR 20077015414 A 20070705; TW 94142710 A 20051202; US 72052205 A 20051201